“The cluster munitions that you can see in the videos are RBK-250, which is a Soviet made cluster munition.

It’s obviously quite old.

We are not sure how it ended up in Syria, but it is particularly dangerous because old munitions are less likely to detonate on impact and as a result, the duds that are left on the ground remain dangerous for civilians and kids, for weeks, months and sometimes years,” said Bolopion.

Activists say cluster bomb remnants were found in several towns in Idlib province and around Homs, Aleppo and the capital Damascus.